Paper-making machine



(No Model.)

4J. J'.l HARRIS.' PAPER-MYIAKING MACHINE. No, 293.870. Paten-eed-1eb-.i19,1884.

tion than usual.

UNITED STATES I .PATENT Ormes,

JOHN J. HARRIS, OF VILMING'ION, DELAWARE.'

PAPER-MAKING MACHINE..

SPECIFICATION forming part of Letters Patent-No. 293,870, dated February19, 1884.

Applivat'on filed ovember 30, 183. (No model.)

will be prevented. A further object is to ren-' der said press-rollsmore effective in their ae- These objects I attain in the mannerhereinafter set forth, reference being had to the accompanying drawings,in which* Figure l is a diagram showing the rolls of a paper-makingmachine to which my invention relates, the web of paper also beingshown, but without its supporting-felts; and Fig. 2 is a side view ofpart of the complete machine,

. illustrating other features of my invention.

In Fig. 1, A A' represent the ordinary couchrolls, and B B' theusualfirst press-rolls, which, however, in ordinary paper-making machines arenot arranged as shown in the drawings, the upper press-roll, B, beingdirectly above the lower roll, and the upper couch-roll, A, but slightlyin advance of the lower roll A'. The couch-rolls A A' are covered withfelt, 'and the web x of paper passes between them before passing to thepress-rolls, inl order that the water may be expressed from the web andthe latter reduced to such arm and coherent sheet that it may besubjected to the action of the couch-rolls is not reduced to thenecessary dry and firm condition, and when it reaches the press-rolls ithas a tendency to adhere to the upper roll, the web being thus brokenand the stoppage of the machine necessitated until the defect can beremedied. To overcome this objection, Iuse three couchrolls instead oftwo,

as usual, the extra roll A2V being, by preference, of metal and ofsmaller diameter than the others, and being arranged inl advance of thelower roll A', the upper roll, A, being also advanced, as shown, so thatithas a a bearing upon both of the lower rolls, A' and A2. By this meansthe vweb of paper in Vpass- .ing between the couch-rolls is subjected topressure first between therolls A and A2 and then between the rolls'machine .passes onto the conveyer-felt F, which runs A and A'. pressureserves to express the greater portion of the moisture from the web, andthe second pressure between the felt-covered rolls A A effects lthedrying and compacting of the web to such an extent that it `can bepassed between the pressrolls without risk of being broken.

I also use an eXtra press-roll, B2, arranged inthe same relation to therolls B B' as the couchA roll A2 in respect to the rolls A A', this rollserving to impart pressure to the web before it reaches the main rolls BB', and thus cause a preliminary hardening of the web before it reachestherolls B B', andlessen the risk of the web-sticking to the upper roll,B, when it arrives at the point 4of discharge from between said rolls BB'.

In Fig. 2 are shown the frame of the machine, the bearings of thevarious rolls, and the Wire-clothand felt which carry the web of paper.

D is the wire-cloth, onv whichthe web of paper is formed, thiswire-cloth passing over a roller, a, thence between the couchrolls AALand A A', thence round the latter roll A', and over supportingrollers tothe front end of the From the wire-cloth D lthe web .t

over the usual carrier-rolls, b, and round tightening-rollsf, and servesto carry the web xbe. tween the press-rolls; Each bearing of the uppercouch-roll, A", is carried bya pivoted arm, G, eonnectedby a rod, g, toa weighted lever, H,'hung to the frame of the machine, and the bearingof the upper press-roll, B, is connected to -a lever, h, from which arod, i, extends to a compound lever, J J', as shown, these devicesforming no part of my invention. The bearings of the lower couch-roll A2and lower press-roll B2, however, are acted upon by rods l m, bearingupon (or they may be connectedto) the short arms of levers M, the longarms of which are weighted, so that the rolls A2 and Biare pressedupward against the rolls A .and B. In order, however, that this upwardpressure may have no tendency to counteract the weight onv the upperrolls, or tend.- to raise the same from therolls A' B', the fulerum ofthe levers Mare upon nuts n, carried by the rods g i, so that the effectof the weighted levers M is exerted equally uponv the rolls A A2 or BB2, and the tendency is simply to pull these rolls The first IOOtogether without in any wey modifying` the tendency of the otherweightedlevers to press the rolls A B upon the rolls A B. vVhile thisarrangement is preferred, however, itis not absolutely necessary, as thedownward pull upon the upper roll, A or B, may be so inueh in excess ol'the upward thrust upon the lower roll A2 or B2, that the requiredpressure upon -the roll A or B will be exerted.

I oluini as my invention- 1. The combination of the upper couch-roll, A,of u Fourdrinier machine, the two lower rolls, A und A, upon both ofwhich the upper roll has n, bearing, the pressrolls, and n eonveyer,whereby the web of paper is caused to poss first between the rolls AA2', then between the rolls A A, und thenee to the pressrolls, :is setforth,

2. The combination ofthe eouehrolls A, Af, und A2, ur 1tinged nsdescribed, with the upper press-roll, B, the lower presserolls, B andB2,

providing @double support for said upper roll, and n Conveyor, wherebythe web of paper is eurried first between the eoueh-rollA und the rollsA und A', and then between the roll B and the rolls B2 und B', as setforth.

3. The Combination, in eoueh or press roll mechanism of u papermnehine,of the upper roll and the two lower rolls, with u weighted rod fordepressing seidV upper roll, und a

